128406692 has 6 divisors (see below), whose sum is σ = 224711718. Its totient is φ = 64203344.

The previous prime is 128406683. The next prime is 128406697. The reversal of 128406692 is 296604821.

It can be written as a sum of positive squares in only one way, i.e., 66846976 + 61559716 = 8176^2 + 7846^2 .

It is not an unprimeable number, because it can be changed into a prime (128406697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16050833 + ... + 16050840.

It is an arithmetic number, because the mean of its divisors is an integer number (37451953).

Almost surely, 2^128406692 is an apocalyptic number.

It is an amenable number.

128406692 is a deficient number, since it is larger than the sum of its proper divisors (96305026).

128406692 is a wasteful number, since it uses less digits than its factorization.

128406692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32101677 (or 32101675 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 128406692 is about 11331.6676619110. The cubic root of 128406692 is about 504.5016054664.

The spelling of 128406692 in words is "one hundred twenty-eight million, four hundred six thousand, six hundred ninety-two".